You could buy
You can buy one of the following:
Buy all billionaires
You can buy each US-dollar billionaire one of the following items:
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Acres of the Moon
Cost of an acre of the Sea of Tranquility, from the Lunar Registry for US$37.50 (﷼ 140.60) from source -
Shopping list
You can buy all of the following:
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3 thousand Carl Sagan's Cosmos DVDs
Inspirational and wide-appeal science series. Thirteen episodes, each one hour long. for £11.71 (﷼ 67.37) from source